From a geological point of view, Mt. San Calogero is a large anticline (a section of earth's crust bent by tectonic forces leading it to emerge) subsiding towards E-SE. Rather than Mt. San Calogero, it would be better to call it "Mountain System of San Calogero": as a matter of fact, it is an imposing massif consisting of limestone and dolomite rocks which have formed from the Mesozoic onward, of siliceous strata, and of the so-called numidian flysch (of sedimentary origin).
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The landscape, varied and rough from a geomorphological point of view,
is characterized by different kinds of environments: the rocky
environment, the undergrowth, the garigue, and the grassland.
The
difficult conditions of life characterizing the rocky environment allow
the settlement of herbaceous species or bushes which are often endemic
at various levels: the Mustard, the Sicilian Spurge, Asperula rupestris, the Gromwell with rosemary-shaped leaves, Dianthus rupicola, the Golden Chamomile, the Sicilian Snapdragon, and other plants.
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This Reserve is characterized by a very interesting avifauna, nesting on the steepest walls of the mountain, where you can observe the Golden Eagle, the Buzzard, and the Peregrine.
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